ASTM A213/ASME SA213 TP444 SEAMLESS STAINLESS STEEL U BEND HEAT
EXCHANGER TUBE
Overview
| Features | U' bending is done by cold working process. |
| U' bending is done to the required radius as per customer drawings. |
| The bend portion and six inch leg is stress relieved by resistance
heating. |
| Inert gas (Argon) is passed through it at the required flow rate to
avoid oxidation in ID. |
| The radius is checked for its OD and wall thinning with the
recommended specification. |
| The physical properties and micro-structure is checked at three
different position. |
| Visual inspection for waviness and cracks is done with Dye
Penetrant Test. |
| Each tube is then hydro tested at the recommended pressure to check
for leakage. |
| Cotton ball test is done to check the ID cleanliness of the tube. |
| Thereafter pickled, dried, marked and packed. |
U-Bend Tube are widely used in Heat Exchanger Systems.
Heat-Exchanger Equipment on the basis of Seamless Stainless U-Tubes
and Welded Stainless U bend Tube is essential in strategically
important and critical felds--Nuclear And Petrochemical Machine
Building. YUHONG GROUP start to produce U Bending Tube Since 2006,
up to now already supply more than 30000 tons Stainless Steel U
Bend Tube to 35 countries.
Specification
ASTM A213/A213M-21a Standard Specification for Seamless Ferritic
and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger
Tubes.
| ASTM A213 Grade TP444 equivalents |
| ASTM A176 | ASTM A240 | ASTM A268 | ASTM A276 | ASTM A479 | ASTM A493 | ASTM A580 | ASTM A581 | ASTM A582 | EN | BS | JIS |
| S44400 | S44400 | S44400 | S44400 | S44400 | S44401 | S44400 | S18235 | S18235 | 1.4521 | X2CrMoTi18-2 | X2CrMoTi18-2 | SUS444 |
Chemical Composition
| GRADE | UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N | Ti | Nb |
| TP444 | S444000 | 0.030 | 1.00 | 0.040 | 0.030 | 1.00 | 17.5-19.5 | H | 1.75-2.50 | 0.035 | - | - |
Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (Mpa) min | Elongation (% in 50mm) min | Hardness |
| Rockwell B (HR B) | Brinell (HB) |
|
| TP444 | 60(415) | 40(275) | 20 | 96 | 217 |
Applications
- Oil and gas equipments
- Offshore technology
- Seawater desalination plants
- Chemical industry
- Bridges
- Storage tanks
- Medical Industry
- Civil Engineering
- Pressure vessels, reactor tanks, and heat exchangers
- Rotors, impellers and shafts
- Power plants
- Petrochemical
- Shipbuilding industry
